Added tests for CacheTrackerActor

core/src/main/scala/spark/CacheTracker.scala

@@ -82,7 +82,8 @@ class CacheTrackerActor extends DaemonActor with Logging {
             logInfo("Cache entry removed: (%s, %s) on %s".format(rddId, partition, host))
           }
           locs(rddId)(partition) = locs(rddId)(partition).filterNot(_ == host)
-        
+          reply('OK)
+
         case MemoryCacheLost(host) =>
           logInfo("Memory cache lost on " + host)
           // TODO: Drop host from the memory locations list of all RDDs
@@ -225,6 +226,7 @@ class CacheTracker(isMaster: Boolean, theCache: Cache) extends Logging {
   // Called by the Cache to report that an entry has been dropped from it
   def dropEntry(datasetId: Any, partition: Int) {
     datasetId match {
+      //TODO - do we really want to use '!!' when nobody checks returned future? '!' seems to enough here.
       case (cache.keySpaceId, rddId: Int) => trackerActor !! DroppedFromCache(rddId, partition, Utils.getHost)
     }
   }

core/src/test/scala/spark/CacheTrackerSuite.scala

+package spark
+
+import org.scalatest.FunSuite
+import collection.mutable.HashMap
+
+class CacheTrackerSuite extends FunSuite {
+
+  test("CacheTrackerActor slave initialization & cache status") {
+    System.setProperty("spark.master.port", "1345")
+    val initialSize = 2L << 20
+
+    val tracker = new CacheTrackerActor
+    tracker.start()
+
+    tracker !? SlaveCacheStarted("host001", initialSize)
+
+    assert(tracker !? GetCacheStatus == Seq(("host001", 2097152L, 0L)))
+
+    tracker !? StopCacheTracker
+  }
+
+  test("RegisterRDD") {
+    System.setProperty("spark.master.port", "1345")
+    val initialSize = 2L << 20
+
+    val tracker = new CacheTrackerActor
+    tracker.start()
+
+    tracker !? SlaveCacheStarted("host001", initialSize)
+
+    tracker !? RegisterRDD(1, 3)
+    tracker !? RegisterRDD(2, 1)
+
+    assert(getCacheLocations(tracker) == Map(1 -> List(List(), List(), List()), 2 -> List(List())))
+
+    tracker !? StopCacheTracker
+  }
+
+  test("AddedToCache") {
+    System.setProperty("spark.master.port", "1345")
+    val initialSize = 2L << 20
+
+    val tracker = new CacheTrackerActor
+    tracker.start()
+
+    tracker !? SlaveCacheStarted("host001", initialSize)
+
+    tracker !? RegisterRDD(1, 2)
+    tracker !? RegisterRDD(2, 1)
+
+    tracker !? AddedToCache(1, 0, "host001", 2L << 15)
+    tracker !? AddedToCache(1, 1, "host001", 2L << 11)
+    tracker !? AddedToCache(2, 0, "host001", 3L << 10)
+
+    assert(tracker !? GetCacheStatus == Seq(("host001", 2097152L, 72704L)))
+
+    assert(getCacheLocations(tracker) == Map(1 -> List(List("host001"), List("host001")), 2 -> List(List("host001"))))
+
+    tracker !? StopCacheTracker
+  }
+
+  test("DroppedFromCache") {
+    System.setProperty("spark.master.port", "1345")
+    val initialSize = 2L << 20
+
+    val tracker = new CacheTrackerActor
+    tracker.start()
+
+    tracker !? SlaveCacheStarted("host001", initialSize)
+
+    tracker !? RegisterRDD(1, 2)
+    tracker !? RegisterRDD(2, 1)
+
+    tracker !? AddedToCache(1, 0, "host001", 2L << 15)
+    tracker !? AddedToCache(1, 1, "host001", 2L << 11)
+    tracker !? AddedToCache(2, 0, "host001", 3L << 10)
+
+    assert(tracker !? GetCacheStatus == Seq(("host001", 2097152L, 72704L)))
+    assert(getCacheLocations(tracker) == Map(1 -> List(List("host001"), List("host001")), 2 -> List(List("host001"))))
+
+    tracker !? DroppedFromCache(1, 1, "host001", 2L << 11)
+
+    assert(tracker !? GetCacheStatus == Seq(("host001", 2097152L, 68608L)))
+    assert(getCacheLocations(tracker) == Map(1 -> List(List("host001"),List()), 2 -> List(List("host001"))))
+
+    tracker !? StopCacheTracker
+  }
+
+  /**
+   * Helper function to get cacheLocations from CacheTracker
+   */
+  def getCacheLocations(tracker: CacheTrackerActor) = tracker !? GetCacheLocations match {
+    case h: HashMap[_, _] => h.asInstanceOf[HashMap[Int, Array[List[String]]]].map {
+      case (i, arr) => (i -> arr.toList)
+    }
+  }
+}